// generics/Mixins.cpp

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

#include <string>

#include <ctime>

#include <iostream>

using namespace std;

template<class T> class TimeStamped : public T {

long timeStamp;

public:

TimeStamped() { timeStamp = time(0); }

long getStamp() { return timeStamp; }

};

template<class T> class SerialNumbered : public T {

long serialNumber;

static long counter;

public:

SerialNumbered() { serialNumber = counter++; }

long getSerialNumber() { return serialNumber; }

};

// Define and initialize the static storage:

template<class T> long SerialNumbered<T>::counter = 1;

class Basic {

string value;

public:

void set(string val) { value = val; }

string get() { return value; }

};

int main() {

TimeStamped<SerialNumbered<Basic>> mixin1, mixin2;

mixin1.set("test string 1");

mixin2.set("test string 2");

cout << mixin1.get() << " " << mixin1.getStamp() <<

" " << mixin1.getSerialNumber() << endl;

cout << mixin2.get() << " " << mixin2.getStamp() <<

" " << mixin2.getSerialNumber() << endl;

}

/* Output:

test string 1 1452987605 1

test string 2 1452987605 2

*/